21x=5x-9

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Solution for 21x=5x-9 equation: 



21x=5x-9

We move all terms to the left:

21x-(5x-9)=0

We get rid of parentheses

21x-5x+9=0

We add all the numbers together, and all the variables

16x+9=0

We move all terms containing x to the left, all other terms to the right

16x=-9

x=-9/16

x=-9/16

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